Cochlear implantation through intracochlear fibrosis: A comparison of surgical techniques.

OBJECTIVE: While the implications of ossification on cochlear implantation (CI) have been extensively described, there is a paucity of data regarding the fibrotic stage. We examined the outcomes of different insertion techniques for managing intracochlear fibrosis. STUDY DESIGN: Retrospective review of case series with case-control comparison. SETTING: University-based tertiary-referral otology-neurotology practice. PATIENTS: Between 2009 to 2020, 384 patients underwent CI. Of those, 7 patients (8 ears) demonstrated intracochlear fibrosis. INTERVENTIONS: CI performed 1-4 months following meningitis/labyrinthitis and 12-24 months after idiopathic sudden SNHL. Fibrosis removal (38%) or dilation (63%) permitted implantation. A styleted-electrode was used in 63% due to dense fibrosis. MAIN OUTCOME MEASURES: Postoperative audiometry with CI in place, additional comparisons with audiometric outcomes in age-matched controls. RESULTS: Full insertion achieved in all except one ear with partial ossification. Mean ipsilateral pure tone average (PTA) improved to 29 ± 15 dB and speech discrimination to 72 ± 28%. Fibrosis removal vs. dilation resulted in no PTA differences (p = 0.76). Poorest outcomes occurred with the longest time to surgery. CONCLUSIONS: Good CI audiologic outcomes in the setting of cochlear fibrosis can be achieved and are independent of technique. Instead, they vary with time to implantation. Every attempt should be made to intervene as early as possible.

Conversations in Cochlear Implantation: The Inner Ear Therapy of Today.

As biomolecular approaches for hearing restoration in profound sensorineural hearing loss evolve, they will be applied in conjunction with or instead of cochlear implants. An understanding of the current state-of-the-art of this technology, including its advantages, disadvantages, and its potential for delivering and interacting with biomolecular hearing restoration approaches, is helpful for designing modern hearing-restoration strategies. Cochlear implants (CI) have evolved over the last four decades to restore hearing more effectively, in more people, with diverse indications. This evolution has been driven by advances in technology, surgery, and healthcare delivery. Here, we offer a practical treatise on the state of cochlear implantation directed towards developing the next generation of inner ear therapeutics. We aim to capture and distill conversations ongoing in CI research, development, and clinical management. In this review, we discuss successes and physiological constraints of hearing with an implant, common surgical approaches and electrode arrays, new indications and outcome measures for implantation, and barriers to CI utilization. Additionally, we compare cochlear implantation with biomolecular and pharmacological approaches, consider strategies to combine these approaches, and identify unmet medical needs with cochlear implants. The strengths and weaknesses of modern implantation highlighted here can mark opportunities for continued progress or improvement in the design and delivery of the next generation of inner ear therapeutics.

Preoperative Differences in Intracranial Facial Versus Vestibular Schwannomas: A Four Nerve Assessment.

OBJECTIVES: Assesses whether preoperative functional testing can distinguish vestibular schwannomas from facial nerve schwannomas medial to the labyrinthine segment. STUDY DESIGN: Retrospective cohort. METHODS: Retrospectively review surgically managed intracranial facial and vestibular schwannomas between January 2015 and December 2019 at two tertiary care centers. Patients with neurofibromatosis 2 and surgery for recurrence were excluded. Preoperative functional testing to include House-Brackmann scores, electroneuronography (ENoG), cervical vestibular evoked myogenic potentials (cVEMP), caloric testing, acoustic brainstem responses (ABRs), acoustic reflexes, and audiograms was compared between the two groups of schwannomas. RESULTS: Twelve facial and 128 vestibular schwannomas met inclusion criteria. In only one case was a facial schwannoma diagnosed preoperatively from imaging. No statistically significant difference was found in preoperative House-Brackmann scores, ENoG, cVEMP, caloric testing, ABRs, or acoustic reflexes. Pure tone average was worse in the vestibular schwannoma group (63 dB [95% CI: 58-68 dB] vs. 46 dB [95% CI: 34-58 dB], P = .01), and the difference was more apparent in the lower frequencies. Word recognition score was better in the facial schwannoma group (66% [95% CI: 45-86%] vs. 41% [95% CI: 34-47%], P = .02). CONCLUSION: Specialized preoperative functional evaluation of the nerves of the internal auditory canal cannot reliably predict the presence of an intracranial facial schwannoma. Hearing is better in facial schwannomas, particularly in the lower frequencies. This should raise the index of suspicion for an intracranial facial schwannoma, especially in candidates for hearing preservation vestibular schwannoma surgery. LEVEL OF EVIDENCE: 3 Laryngoscope, 131:2098-2105, 2021.

Shared Surgical Decision Making in the Era of COVID-19: Lessons From Hurricane Katrina.

The COVID-19 pandemic has challenged every surgical discipline. Lessons learned from Hurricane Katrina have informed our department's management of the current crisis. That experience impressed upon us a profound appreciation for shared decision making in the face of scarce resources, an evolving clinical context, and potential harm to patients and health care workers. To that end, we have formed a Resource Utilization Committee to prospectively review all nonemergent surgical cases during the current crisis. This has allowed "state-of-the-pandemic" otolaryngologic care in a real-time, collaborative, and high-information setting. In addition, to protect our patients and health care workers, it has influenced our institution's thoughtful application of COVID testing and the use of personal protective equipment.

Endoscopic Over Under Cartilage Tympanoplasty Is Not Inferior to Underlay Cartilage Tympanoplasty.

Objective: Evaluate whether elevating the tympanic membrane from the malleus during endoscopic tympanoplasty may negatively affect postoperative hearing outcomes or perforation rates by comparing 2 similar endoscopic tympanoplasty techniques. Study Design: Retrospective cohort. Setting: Tertiary care center. Patients: Endoscopic over-under cartilage tympanoplasties age and gender matched to endoscopic underlay cartilage tympanoplasties between January 2015 and January 2019. Exclusion criteria included preoperative or intraoperative cholesteatoma, performance of mastoidectomy or ossicular chain reconstruction, and lack of postoperative audiogram. Interventions: Endoscopic cartilage tympanoplasty via over-under or underlay technique. Main Outcome Measures: Pre- and postoperative pure-tone average and word recognition score, graft success. Results: A total of 52 patients were evaluated: 26 endoscopic over-under cartilage tympanoplasties were matched to endoscopic underlay cartilage tympanoplasties. Both groups demonstrated a statistically significant improvement in air conduction hearing (9 dB [P < 0.001] and 6 dB [P < 0.01], respectively), and bone pure-tone average did not worsen in either group (P < 0.001 and P < 0.05, respectively). Postoperative air conduction pure-tone average was statistically noninferior in the over-under group compared with the underlay group (P < 0.05). Reperforation was present in 3 patients (12%) in the underlay group and none in the over-under group, but this difference was not statistically significant (P = 0.24). Conclusions: Endoscopic over-under cartilage tympanoplasty effectively closes tympanic membrane perforations and improves hearing, without greater risk than underlay tympanoplasty. Elevating the tympanic membrane from the malleus does not confer worsen hearing outcomes.

Can Dizziness Handicap Inventory and Activities-Specific Balance Confidence Scores Assess Vestibular Loss After Vestibular Schwannoma Excision?

OBJECTIVE: Evaluate and compare the Dizziness Handicap Inventory with Activities-specific Balance Confidence scores shortly after vestibular schwannoma excision. STUDY DESIGN: Retrospective database review. SETTING: Tertiary care center. PATIENTS: Adults undergoing vestibular schwannoma excision between January 2015 and December 2019. INTERVENTION: Diagnostic, therapeutic, and rehabilitative. MAIN OUTCOME MEASURES: Postoperative change in Dizziness Handicap Inventory scores and Activities-specific Balance Confidence scores 2 to 3 weeks after surgical intervention in relation to preoperative vestibular testing. RESULTS: A total of 49 patients met inclusion criteria. The average change in the Dizziness Handicap Inventory was 6 (p = 0.07, 95% CI 0-13). This was weakly correlated to preoperative caloric testing values (r = -0.31, p = 0.03), but not cervical vestibular evoked myogenic potentials (cVEMP) values (r = -0.17, p = 0.23). The average change in Activities-specific Balance Confidence was -10% (p = 0.007, 95% CI -3 to -17%). This change was moderately correlated with preoperative caloric values (r = 0.42, p = 0.006), but it was not correlated with cVEMP (r = 0.07, p = 0.66). CONCLUSIONS: In vestibular schwannoma patients, factors other than preoperative vestibular function likely affect postoperative Dizziness Handicap Inventory and Activities-specific Balance Confidence scores. The change in Activities-specific Balance Confidence was slightly more consistent with expected physiological vestibular loss, and it represents another tool in a multidisciplinary vestibular evaluation of the postoperative patient.

Next-Day Loading of a Bone-Anchored Hearing System: Preliminary Results.

OBJECTIVES: To demonstrate the feasibility and efficacy for next-day loading of a percutaneous bone-anchored hearing device. STUDY DESIGN: Multicenter prospective cohort study. SETTING: Tertiary neurotologic referral centers. SUBJECT AND METHODS: In this multicenter prospective study, a 4.5-mm laser-etched bone-anchored hearing device was implanted in adult subjects who had conductive/mixed hearing loss or single-sided deafness. One day following implantation, the surgical site was assessed for soft tissue reaction per the Holgers Scale, and implant stability was evaluated by manual palpation and resonance frequency analysis. On the same day, subjects were fitted with the processor. Follow-up evaluations were at 1 week, 4 weeks, 3 months, 6 months, and 12 months. The Glasgow Benefit Inventory and Abbreviated Profile of Hearing Aid Benefit questionnaires were completed postoperatively. RESULTS: Fourteen devices were implanted in 12 subjects. Two subjects underwent bilateral implantation. Implant stability was rated as firm at every interval for all ears, and the Implant Stability Quotient values at 3 months were stable or increased as compared with day 1 measurements. Skin irritation was limited to Holgers grade 0 and 1, with the majority having no skin irritation. The mean Glasgow Benefit Inventory global score was +43.8, and the mean Abbreviated Profile of Hearing Aid Benefit global benefit score was 60.2%. All 14 implants have remained firmly anchored. CONCLUSIONS: Next-day loading of this 4.5-mm-diameter percutaneous bone-anchored hearing device appears to be a feasible alternative to the original 3-month delayed loading. Although this is a preliminary study, the results support continued investigation of a next-day loading strategy.

Cochlear Enhancement May Precede Cochlear Obliteration After Vestibular Schwannoma Excision.

OBJECTIVE: Cochlear obliteration after vestibular schwannoma excision has been noted, with implications on cochlear implantation. Early postoperative cochlear enhancement with gadolinium on magnetic resonance imaging (MRI) has also been observed. Timing of enhancement and association with obliteration is described here. STUDY DESIGN: Retrospective case review. SETTING: Tertiary referral center, ambulatory. PATIENTS: Patients receiving vestibular schwannoma excision surgery by the senior author performed at one institution between January 2015 and July 2017 with postoperative MRIs INTERVENTION:: Diagnostic. MAIN OUTCOME MEASURE(S): The imaging characteristics on postoperative MRIs examined were loss of fluid signal on postoperative T2 images and cochlear enhancement on gadolinium enhanced T1 images. In the patients receiving labyrinthine sparing procedures, presence of postoperative hearing was evaluated. RESULTS: Of the 42 patients evaluated, 24 received the translabyrinthine approach and 18 received a labyrinth sparing surgery. Twenty-nine had evidence of cochlear enhancement on T1 with gadolinium contrast, and 27 had evidence of cochlear obliteration on T2 images. The odds ratio of patients with cochlear enhancement having obliteration was 30.0:1 (p < 0.0001). Intense cochlear enhancement (n = 21) appeared a median of 163 days after surgery, and complete or near complete obliteration (n = 18) appeared a median of 480 days after surgery, a statistically significant difference (p < 0.001). Within the labyrinth sparing group, there was no statistically significant association between hearing loss and cochlear obliteration or enhancement. CONCLUSIONS: Cochlear enhancement is correlated with cochlear obliteration and may precede it.

Cochlear implantation via middle fossa approach - a case report.

Objective: Cochlear implantation is routinely performed all over the world via the post-auricular, facial recess approach. Our case study describes the middle fossa approach for the management of bilateral profound sensorineural hearing loss in a female child with multiple external, middle and inner ear malformations. The middle fossa approach has been reported sporadically and has been used inconsistently in patients with chronic otitis media and inner ear malformations. Case study: A 3-year-old female child presented with bilateral profound sensorineural hearing loss, bilateral anotia, right cochlear nerve agenesis, right facial paralysis, bilateral mild inner ear dysplasia and an aberrant left facial nerve covering the left round window. Further tests indicated that she was a suitable candidate for cochlear implantation and was medically cleared for surgery. In view of the multiple malformations and high risk of injury to her only functioning left facial nerve on the side with a cochlear nerve, cochlear implantation via a middle fossa approach was performed. Conclusion: Middle fossa approach to cochlear implantation is challenging but can be safely performed even in children and offers an option in patients when a routine mastoidectomy, facial recess and round window approach cannot be undertaken.

Malignant Hyperthermia During Translabyrinthine Acoustic Neuroma Surgery After Previous Uneventful Surgery.

OBJECTIVE: Review current literature and guidelines for malignant hyperthermia in the context of neurotologic surgery. PATIENT: A case of malignant hyperthermia during vestibular schwannoma surgery, in a patient previously exposed to anesthesia. INTERVENTIONS: Excision of vestibular schwannoma, acute management of malignant hyperthermia. MAIN OUTCOME MEASURES: Knowledge of the basic pathophysiology, clinical manifestations, and treatment protocols for malignant hyperthermia. RESULTS: Rapid termination of the procedure and appropriate modifications in surgical technique permitted expeditious treatment of malignant hyperthermia and prevented its lethality. CONCLUSIONS: Malignant hyperthermia is a rare and lethal condition that may arise in neurotologic surgery, even in patients who have previously received general anesthesia. The neurotologic surgeon has a role in early recognition and expeditious termination of surgery to help reduce its mortality.

Endoscopic Inside-Out Mastoidectomy with the Ultrasonic Bone Aspirator.

We report our experience using the ultrasonic bone aspirator (UBA) for transcanal endoscopic "inside out" mastoidectomy. The UBA has irrigation, suction, and nonrotatory ultrasonic bone-removing technology in 1 handpiece, which makes it appropriate for bone removal during this procedure. The results of our study show that this technique is safe and effective for patients with cholesteatoma in a small sclerotic mastoid. We also discuss the nuances associated with using the UBA during endoscopic ear surgery.

Post-Katrina: study in crisis-related program adaptability.

OBJECTIVE: To discuss disaster planning, didactic reorganization, and clinical realignments useful in rebuilding academic otolaryngology residency programs after disaster. SUMMARY: We describe our reorganization and analysis of objective measures in resident education before and after Hurricane Katrina. Post-Katrina, the number of full-time faculty and part-time clinical instructors/gratis faculty has decreased (4 vs 9 and 36 vs 43, respectively), but the number of part-time LSU faculty (private-academic partnership) has increased (0 vs 3) with overall improved resident supervision. Resident complement decreased by 9.3%. Surgical case loads are essentially unchanged. Reorganization of the didactic schedule has increased attendance and maintained examination scores above national averages. Establishment of two new practice sites provided an adequate number of patients for residency training. CONCLUSION: Poststorm reorganization has maintained or exceeded pre-Katrina performance standards. Establishment of communication and data retrieval proved irreplaceable and demand advance preparation.

Enhanced hearing in heat-activated-crimping prosthesis stapedectomy.

OBJECTIVES: Compare short-term hearing outcomes with a heat-activated-crimping versus manual-crimping stapedectomy prosthesis. STUDY DESIGN: Retrospective chart review. SETTING: Tertiary care neurotology referral center. PATIENTS: 219 charts reviewed. INTERVENTION: Laser stapedectomy. MAIN OUTCOME MEASURES: Audiometric. METHODS: Retrospective study comparing postoperative hearing in manual-crimp prostheses stapedectomies versus heat-activated-crimp prostheses stapedectomies. RESULTS: Of the 219 patients reviewed, 94 met inclusion criteria for the study, with 47 receiving manual-crimp prosthesis and 47 receiving heat-activated-crimp prosthesis. Short-term poststapedectomy air-bone gaps, long-term air-bone gaps, long-term pure-tone averages, and long-term air-bone gap closures were significantly better for heat-activated-crimp versus manual-crimp prostheses. CONCLUSION: Heat-activated-crimping prostheses demonstrated enhanced stapedectomy hearing outcomes versus manual-crimping prostheses on short- and long-term follow-up. Three-dimensional reorientation of the heat-activated prosthesis may enhance the hearing outcome; however, theoretical nickel allergy considerations, effects of case selection, follow-up duration, possible eventual loosening of the heat-activated crimp, and long-term incus necrosis are considerations requiring continued longitudinal analysis.

Balloon dilation of the eustachian tube for dilatory dysfunction: A randomized controlled trial.

OBJECTIVES/HYPOTHESIS: To assess balloon dilation of the Eustachian tube with Eustachian tube balloon catheter in conjunction with medical management as treatment for Eustachian tube dilatory dysfunction. STUDY DESIGN: In this prospective, multicenter, randomized, controlled trial, we assigned, in a 2:1 ratio, patients age 22 years and older with Eustachian tube dilatory dysfunction refractory to medical therapy to undergo balloon dilation of the Eustachian tube with balloon catheter in conjunction with medical management or medical management alone. METHODS: The primary endpoint was normalization of tympanogram at 6 weeks. Additional endpoints were normalization of Eustachian Tube Dysfunction Questionaire-7 symptom scores, positive Valsalva maneuver, mucosal inflammation, and safety. RESULTS: Primary efficacy results demonstrated superiority of balloon dilation of the Eustachian tube with balloon catheter + medical management compared to medical management alone. Tympanogram normalization at 6-week follow-up was observed in 51.8% (72/139) of investigational patients versus 13.9% (10/72) of controls (P < .0001). Tympanogram normalization in the treatment group was 62.2% after 24 weeks. Normalization of Eustachian Tube Dysfunction Questionaire-7 Symptom scores at 6-week follow-up was observed in 56.2% (77/137) of investigational patients versus 8.5% (6/71) controls (P < .001). The investigational group also demonstrated substantial improvement in both mucosal inflammation and Valsalva maneuver at 6-week follow-up compared to controls. No device- or procedure-related serious adverse events were reported for those who underwent balloon dilation of the Eustachian tube. CONCLUSIONS: This study demonstrated superiority of balloon dilation of the Eustachian tube with balloon catheter + medical management compared to medical management alone to treat Eustachian tube dilatory dysfunction in adults. LEVEL OF EVIDENCE: 1b. Laryngoscope, 128:1200-1206, 2018.

Endolymphatic mastoid shunt versus endolymphatic sac decompression for Ménière's disease.

OBJECTIVE: This study compares the efficacy of endolymphatic mastoid shunt (EMS) versus endolymphatic sac decompression (ESD) without sac incision for the treatment of Ménière's disease. STUDY DESIGN AND SETTING: The AAO-HNS Guidelines for the Diagnosis and Evaluation of Therapy in Ménière's disease were used to retrospectively identify suitable candidates for the study. All patients who failed medical management and underwent either endolymphatic-mastoid shunt (EMS) (n = 88) or endolymphatic sac decompression (ESD) (n = 108) were selected for review using the AAO-HNS guidelines. The study was carried out at a tertiary care neurotology private practice. RESULTS: EMS and ESD were equally effective in reducing the incidence and severity of vertigo attacks with significant improvement in 67 percent and 66 percent of patients, respectively. CONCLUSION: Both EMS and ESD are effective, nondestructive alternatives for patients who have failed medical management of Ménière's disease with similar long-term hearing outcomes. SIGNIFICANCE: This is the only study within the same institution using AAO-HNS guidelines comparing EMS versus ESD.

Hydroxyapatite cement cranioplasty in translabyrinthine acoustic neuroma surgery-update.

OBJECTIVE: To update the outcome of hydroxyapatite cement cranioplasty in translabyrinthine acoustic neuroma (TLAN) surgery. PATIENTS: One hundred eight previously reported patients undergoing abdominal fat graft reconstruction versus hydroxyapatite cement cranioplasty with additional 4-year follow up. Ninety additional patients undergoing a uniform technique of hydroxyapatite cement cranioplasty after TLAN. INTERVENTION(S): After TLAN, strips of abdominal fat are placed through the dural opening and medial to the level of the mastoid antrum, filling the lateral mastoid cavity. MAIN OUTCOME MEASURE(S): Cerebrospinal fluid (CSF) leaks and wound complications. RESULTS: No additional CSF leaks or wound complications were identified in the patients included in the previous report. In the new series of 90 consecutive patients, there was one CSF leak. CONCLUSION: Hydroxyapatite cranioplasty is a reliable method to avoid CSF leaks after TLAN surgery.

Hydroxyapatite cement cranioplasty following translabyrinthine approach: Long-term study of 369 cases.

OBJECTIVE: To report the authors' experience with hydroxyapatite cement (HAC) cranioplasty and analyze the material's long-term safety and efficacy in repairing translabyrinthine skull-base defects by examining adverse events, specifically cerebrospinal fluid (CSF) leaks and surgical site infections. STUDY DESIGN: Retrospective case-control study (primary study arm); prospective cross-sectional study of patients not examined within the last 5 years (secondary arm). SETTING: tertiary-care neurotology private practice and academic practice (two centers). METHODS: Hydroxyapatite cement implanted following translabyrinthine approach, with or without fat graft, was included. Combined approaches were excluded. Implant-associated adverse events were defined as 1) CSF leaks requiring reoperation or spinal drainage, and (2) infections requiring reoperation. Patients not examined within 5 years were interviewed by telephone to update their condition. Incidence of adverse events was compared to published data for translabyrinthine cranioplasty using fat graft alone. Implant survival analysis was performed. RESULTS: The study cohort included 369 HAC implants in the same number of patients. There were seven CSF leaks and seven infections. Combined (n = 14) incidence of adverse events was 3.8% (2.09%, 6.28%). Compared to fat graft alone, the adverse events associated with HAC were fewer (P < 0.001). Up to 15 years (5,475 days), HAC cement maintained 95% adverse event-free survival. There were no cases of meningitis. CONCLUSION: Cranioplasty using HAC with autologous fat following translabyrinthine skull-base surgery is safer and more effective than fat graft alone, up to 15 years after surgery. LEVEL OF EVIDENCE: 4. Laryngoscope, 127:2120-2125, 2017.

Petrous apex effusion: a clinical disorder.

INTRODUCTION: Petrous apex fluid accumulations without evidence of acute infection are routinely managed as "leave alone lesions" without potential morbidity. Are petrous apex fluid accumulations (effusions) in the absence of acute infection always asymptomatic without the need for treatment? If petrous apex effusions can produce symptoms separate from acute infections, what are the clinical outcomes in these patients? STUDY DESIGN: Retrospective clinical review. METHODS: A retrospective record review of 31 patients presenting with petrous apex effusions was performed with recording of clinical characteristics, interventions, and outcomes. RESULTS: Eighteen of the 31 patients had clinical symptoms referable to the petrous apex effusion with the following characteristics: indolent and previous infections (4), hearing loss (3), headache and pressure alone (8), facial spasms (1), and positional vertigo (2). Overall, 5 of 18 symptomatic patients resolved with antibiotics, steroids, or positioning maneuvers. Three of five infracochlear drainages produced symptom resolution. Three of four patients undergoing retrolabyrinthine drainage had symptom resolution, and four of seven middle fossa drainages yielded symptom resolution. In contrast, infratemporal fossa drainage procedures did not resolve the patients' symptoms. CONCLUSIONS: Isolated petrous apex effusions are rare, but they can cause symptoms. If medical management fails, surgical drainage based on the location is appropriate. The surgical drainage approach selected (infracochlear, infralabyrinthine, middle fossa, and endoscopic transnasal) should be based on an anatomic consideration of the involved petrous apex air cells (superior vs. inferior) and the relative position of the carotid artery and jugular bulb.

Visually enhanced vestibulo-ocular reflex: a diagnostic tool for migraine vestibulopathy.

OBJECTIVES: 1) To compare the incidence of elevated visually enhanced vestibular-ocular reflex (VVOR) rotational gain during rotational chair testing in a normal control group versus a group of patients diagnosed with migraine vestibulopathy; 2) to discuss the possible application of VVOR gain during rotational chair testing for diagnosing migraine vestibulopathy. STUDY DESIGN: Prospective normal control group and retrospective cohort comparison. METHODS: 1) Prospective rotational chair studies including VVOR in 20 normal control patients; 2) retrospective review of vestibular studies including VVOR in 100 consecutive patients with migraine vestibulopathy. RESULTS: Twenty of the normal controls and 69 of the migraine vestibulopathy patients met all inclusion criteria. One of 20 (5%) normal control patients had elevated VVOR gain, whereas 49 of 69 (71%) of migraine vestibulopathy patients had elevated VVOR gain. CONCLUSIONS: VVOR gain normal criteria were appropriate in 95% of our normal control test group. VVOR gain was more frequently elevated in migraine vestibulopathy patients than in the normal controls, and the difference was significant (P < .001). VVOR gain elevation was the most common vestibular test abnormality in this cohort of patients with migraine vestibulopathy. Because VVOR measures visual-vestibular interaction and its central connections, this parameter may be a useful diagnostic tool for migraine vestibulopathy in patients manifesting disequilibrium and motion sensitivity.

Is MRI Equal to CT in the Evaluation of Thin and Dehiscent Superior Semicircular Canals?

OBJECTIVE: Can magnetic resonance imaging (MRI) diagnose abnormally thin and dehiscent superior semicircular canals (SSCs) that traditionally rely on evaluation by computed tomography (CT) imaging? STUDY DESIGN: Retrospective clinical study. SETTING: Tertiary referral center. PATIENTS: Adults who underwent both MRI and CT of the temporal bones over the past 3 years. INTERVENTIONS: CT and MR images of SSCs were separately reviewed, in a blinded fashion by three neuroradiologists at our institution. CT diagnosis of abnormally thin or dehiscent SSC was used as the "gold" standard. MAIN OUTCOME MEASURES: 1) Dehiscent SSC. 2) Abnormally thin SSC. 3) Normal SSC. RESULTS: One hundred temporal bones with evaluable superior semicircular canals from 51 patients were eligible for review on CT and MR imaging. There were 26 patients of thin SSC and 17 patients of SSC dehiscence on CT imaging, of which 13 and 15 respectively were also found on MRI. There were nine false-positive dehiscent SSC patients and four thin SSC patients observed on MR imaging while not observed on CT. For thin SSCs, MRI sensitivity was 61.9% and specificity of 94.3% with a positive predictive value of 81.3% and a negative predictive value of 86.2%. For dehiscent SSCs, sensitivity was 88.2% and specificity of 89.2% with a positive predictive value of 62.5% and a negative predictive value of 97.4%. CONCLUSION: In this series, MRI in the axial and coronal plane had a high negative predicative value for thin SSC (86%) and dehiscent SSC (97%). However, MRI cannot conclusively diagnose thin or dehiscent SSCs.